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Acquisition - Additional Information (Details)
a in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 12, 2018
USD ($)
Feb. 14, 2018
USD ($)
a
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Permian Basin Acquisition [Member]        
Business Acquisition [Line Items]        
Net acres acquired | a   22    
Cash   $ 549,770    
Aggregate consideration paid in shares (shares) | shares   46,000,000    
Consideration paid to Forge Energy   $ 920,990    
Actual total revenue of acquiree included in condensed financials     $ 19,400 $ 51,000
Actual operating income of acquiree included in condensed financials     3,900 14,200
Finite lived intangible asset   $ 1,000    
Other Delaware Acquisition [Member]        
Business Acquisition [Line Items]        
Consideration paid to Forge Energy $ 59,500      
Noncompete Agreements [Member] | Permian Basin Acquisition [Member]        
Business Acquisition [Line Items]        
Useful life of acquired intangible asset   1 year    
Amortization of Intangible Assets     $ 300 $ 600